JPH02240907A - Method of taking out lead wire of metallized film capacitor - Google Patents

Abstract

PURPOSE:To decrease the electrode resistance of an electrode by metallic flame- coating so as to prevent heat generation during use by using a lead wire whose end part is divided into many fine line parts, and scattering the fine line parts on the electrode face with spaces between so as to fuse them. CONSTITUTION:A braided wire 3 is a lead wire having a broad shape, and the end part is divided into plural fine line parts 3A. And this fine line pars 3A are arranged on the face of an electrode 2 by flame-coated metal so that they may be scattered as far as possible, and each fine line part 3A is welded severally by solder 4A. Accordingly, for each part of the electrode face, the current path to the lead wire substantially become shorter. Hereby, the electrode resistance can be decreased, and further in case of fusing the fine line part 3A, soldering can be done easily at low temperature, so accidents by deformation of a deposited film can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for drawing out lead wires from electrodes formed by metal spraying of a metallized film capacitor.

[Conventional technology]

In capacitors for signals, etc., the tip of a round lead wire is usually drawn out by soldering or welding it to the electrode surface, either as is or by crimping it. In power capacitors, braided wire is used as the lead wire in order to increase the contact area and reduce contact resistance. As shown in FIG. 4, 1 is a laminate formed by winding a metal-deposited film, and an electrode 2 made of sprayed metal (metallicon) is formed on the end face of this winding. Apply solder 4 to the center of electrode 2.
The tip of the A3 sheet is soldered and pulled out.

[Problem to be solved by the invention]

By the way, since this type of capacitor uses an organic film, it is sensitive to heat, and when soldering a wide braided wire, a considerable amount of heat is applied, causing the film to deform and damage the evaporated part of the film and the sprayed metal. This resulted in poor contact with the metal, causing a decrease in yield. In addition, when the electrode area is large, the electrode resistance up to the fixed part of the lead wire cannot be ignored.
In high-current applications, heat generation increases, which can lead to malfunctions.

An object of the present invention is to eliminate the above-mentioned drawbacks in metallized film capacitors and to provide a highly reliable lead wire extraction method even in high current applications.

[Means to solve the problem]

The lead wire drawing method of the present invention uses a lead wire whose tip portion is divided into a large number of thin wire portions, and the thin wire portions are distributed and welded at intervals on the electrode surface. Another method is to embed the lead wire in the sprayed metal. After the electrode is sprayed with metal, the lead wire whose tip is divided into many thin wire parts is placed on the metal sprayed surface.
The metal spraying is performed from above again after the metals are arranged in a dispersed manner.

[Effect]

The tip of the lead wire is divided into many thin wire sections, and these thin wire sections are distributed and arranged on the electrode surface made of sprayed metal.
Each part of the electrode surface has a substantially shorter current path to the lead wire. This allows electrode resistance to be reduced. Also, when welding thin wire parts by soldering, low soldering temperature
Since soldering is easy, accidents caused by deformation of the deposited film do not occur.

(Example) Hereinafter, examples of the present invention will be described with reference to the drawings. As shown in Figure 1, which is an external view of a film capacitor manufactured according to an embodiment in which the tips of the lead wires are soldered, the braided wire 3 is a lead wire with a wide shape.
The tip portion is divided into a plurality of thin wire portions 3A.

The thin wire portions 3A are arranged so as to be dispersed as much as possible on the surface of the electrode 2 made of sprayed metal, and each thin wire portion 3A is soldered with solder 4A.

FIG. 2 shows an example of measuring the resistance between the terminals when manufactured by the above method. However, this example has a rating of 10uF, 20
Measurements were taken on a sample (sheet-wound product) with the same dimensions as a 0V film capacitor and with the zinc-deposited layers of the film in contact with each other. was formed and the resistance between its terminals was measured. The measured value on the vertical axis is the resistance value obtained by subtracting the vapor deposited film resistance from the terminal resistance, and is mainly the contact resistance between the vapor deposited metal of the film and the sprayed metal of the electrode, and the electrode resistance due to the current path. Compared to the case of the conventional example, the resistance is 〃.

Next, a method of embedding the tip of the lead wire will be explained. FIG. 3(a) is an external view of a film capacitor manufactured by this method, and FIG. 3(a) is a sectional view taken along line A-A of the electrode portion.

The tip of the braided wire 3 is branched in the same manner as in the above method, and has a plurality of thin wire portions 3A. In this method, first, a base metallicon layer 10 is formed by metal spraying, and then the thin wire portions 3A are arranged as far apart as possible, and metal spraying is performed on top of that to form a base metallicon layer 11. Since the thin wire part 3A is embedded in the
The tip of the lead wire is fixed. As a metallic layer,
In the normal method, the thickness is about 1 day, but in this method, for example, the base layer is 0.5 m thick and the upper layer is 0.5 m thick.・Approximately 51■.

〔Effect of the invention〕

As explained above, in the method of the present invention, when a wide braided lead wire is used for a high-power capacitor, the tip of the lead wire is branched into a plurality of thin wire portions, and these thin wire portions are used as electrodes of a film capacitor. By distributing them as much as possible on the surface and welding them by soldering or welding, the electrode resistance of the electrode due to metal spraying can be substantially reduced.
Prevents heat generation during use. In addition, when drawing out leads in the manufacturing process, soldering or welding between the thin wire part and the electrode can be done with a small amount of thermal power, so there is no deterioration or deformation of the organic film due to this, and there is no contact resistance between the vapor-deposited metal and the electrode. There is no increase in

As an alternative method, when metal spraying is used to form electrodes, two
Although the tips of the lead wires are buried at different times, similar effects can be obtained.

It goes without saying that the lead wire does not have to be limited to a braided wire, as long as its tip has a finely divided shape.

[Brief explanation of drawings]

Figure 1 is an external view of a film capacitor manufactured according to one embodiment of the present invention, Figure 2 is a diagram showing the actual measured terminal resistance of a special prototype of the same embodiment, and Figure 3 is a diagram of a film capacitor manufactured according to another embodiment. Fig. 4 is an external view of a film capacitor manufactured according to a conventional example. 1- Laminated body, 2- Electrode (metallicon electrode), 3-
Braided wire, 3A--thin wire portion, 4 A--Solder, 10-Metallicon layer (base), 11--Metallicon 11 (upper layer).

Claims (2)

[Claims] 1. In the manufacture of capacitors in which electrodes are formed by metal spraying on the end surface of the winding end of a wound metallized film, a lead wire whose tip is divided into a number of thin wire sections is used, and the thin wire sections are placed on the electrode surface. A method for drawing out lead wires for a metallized film capacitor, which comprises distributing and welding the lead wires at intervals and drawing out the lead wires. 2. In the manufacture of capacitors, in which electrodes are formed by metal spraying on the end surface of the winding end of a wound metallized film, after the metal spraying of the electrodes, a lead wire whose tip end is divided into a number of thin wire parts is used. A metallized film capacitor characterized in that the metallized film capacitor is set so as to be dispersedly arranged on the metal sprayed surface, and then the metal is sprayed again from the top surface, the lead wire tip is embedded in the sprayed metal, and the lead wire is drawn out. How to draw out the lead wire.